Circuitry and method for reducing environmental noise

Abstract

The present disclosure provides a circuitry. The circuitry includes a comparator and a signal correlated circuit. The comparator includes a first input terminal, a second input terminal, and an output terminal. The signal correlated circuit includes a first input terminal, a second input terminal, a first output terminal, and a second output terminal. The first input terminal is coupled to receive a first input signal. The second input terminal is coupled to receive a second input signal independent from the first input signal. The first output terminal is configured to generate a first output signal and to send the first output signal to the first input terminal of the comparator. The second output terminal is configured to generate a second output signal and to send the second output signal to the second input terminal of the comparator. The first output signal and the second output signal are correlated.

What is claimed is: 
     
       1. A circuitry, comprising:
 a comparator comprising a first input terminal, a second input terminal, and an output terminal; 
 a signal correlated circuit configured to receive a first input signal and a second input signal independent from the first input signal, wherein the signal correlated circuit is configured to generate a first output signal and to send the first output signal to the first input terminal of the comparator, and wherein the signal correlated circuit is configured to generate a second output signal and to send the second output signal to the second input terminal of the comparator; 
 a first digital-to-analog converter (DAC) connected to the signal correlated circuit, wherein the first DAC is configured to convert a first digital signal into the first input signal and transmit the first input signal to the signal correlated circuit; 
 a second DAC connected to the signal correlated circuit, wherein the second DAC is configured to convert a second digital signal into the second input signal and transmit the second input signal to the signal correlated circuit; and 
 a receiver unit connected to the output terminal of the comparator and configured to generate a feedback signal in response to an output signal of the comparator, wherein the first digital signal and the second digital signal are adjusted based on the feedback signal. 
 
     
     
       2. The circuitry of  claim 1 , wherein the first output signal is correlated to the first input signal and the second input signal, and the second output signal is correlated to the first input signal and the second input signal, wherein the first output signal includes a first noise signal and the second output signal includes a second noise signal, and wherein the comparator is configured to remove the first noise signal and the second noise signal by a differential comparing. 
     
     
       3. The circuitry of  claim 1 , wherein the comparator has a resolution being micro-voltage level. 
     
     
       4. The circuitry of  claim 1 , wherein the signal correlated circuit includes a first resistor, a second resistor, a third resistor, and a fourth resistor, wherein the first resistor and the second resistor are configured to receive the first input signal, and the third resistor and the fourth resistor are configured to receive the second input signal, and wherein the first resistor is connected between the second resistor and the third resistor, and the fourth resistor is connected between the second resistor and the third resistor. 
     
     
       5. The circuitry of  claim 4 , wherein a resistance of the first resistor is identical to the fourth resistor, and a resistance of the second resistor is identical to the third resistor. 
     
     
       6. The circuitry of  claim 5 , wherein the resistance of the first resistor, the second resistor, the third resistor, and the fourth resistor is in a range of 10 to 100 Ohms. 
     
     
       7. The circuitry of  claim 4 , wherein the first output signal is obtained at a first node between the first resistor and the third resistor, and the second output signal is obtained at a second node between the second resistor and the fourth resistor. 
     
     
       8. The circuitry of  claim 1 , further comprising:
 a field programmable gate array (FPGA) board connected to the first DAC and the second DAC, and configured to generate the first digital signal transmitted to the first DAC and the second digital signal transmitted to the second DAC. 
 
     
     
       9. The circuitry of  claim 1 , wherein the signal correlated circuit includes a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor, wherein the first capacitor and the second capacitor are configured to receive the first input signal, and the third capacitor and the fourth capacitor are configured to receive the second input signal, and wherein the first capacitor is connected between the second capacitor and the third capacitor, and the fourth capacitor is connected between the second capacitor and the third capacitor. 
     
     
       10. The circuitry of  claim 9 , wherein a capacitance of the first capacitor is identical to the fourth capacitor, and a capacitance of the second capacitor is identical to the third capacitor. 
     
     
       11. The circuitry of  claim 9 , wherein the first output signal is obtained at a first node between the first capacitor and the third capacitor, and the second output signal is obtained at a second node between the second capacitor and the fourth capacitor. 
     
     
       12. A circuitry, comprising:
 a first digital-to-analog converter (DAC) configured to convert a first digital signal into the first input signal; 
 a second DAC configured to convert a second digital signal into the second input signal; 
 a signal correlated circuit connected to the first DAC to receive the first input signal and connected to the second DAC to receive the second input signal, wherein the signal correlated circuit is configured to generate a first output signal and a second output signal; 
 a comparator comprising a first input terminal connected to the signal correlated circuit to receive the first output signal, a second input terminal connected to the signal correlated circuit to receive the second output signal, and an output terminal configured to generate an output signal in response to the first output signal and the second output signal; and 
 a receiver unit connected to the output terminal of the comparator and configured generate a feedback signal in response to the output signal of the comparator, wherein the first digital signal and the second digital signal are adjusted based on the feedback signal, 
 wherein the first input signal is independent from the second input signal. 
 
     
     
       13. The circuitry of  claim 12 , wherein the first output signal is a sum of a first part of the first input signal and a second part of the second input signal, and the second output signal is a sum of a third part of the first input signal and a fourth part of the second input signal. 
     
     
       14. The circuitry of  claim 12 , wherein the signal correlated circuit includes a first resistor, a second resistor, a third resistor, and a fourth resistor, wherein the first resistor and the second resistor are configured to receive the first input signal, and the third resistor and the fourth resistor are configured to receive the second input signal, and wherein the first resistor is connected between the second resistor and the third resistor, and the fourth resistor is connected between the second resistor and the third resistor. 
     
     
       15. The circuitry of  claim 14 , wherein a resistance of first resistor is identical to fourth resistor thereof, and a resistance of second resistor is identical to third resistor thereof. 
     
     
       16. The circuitry of  claim 14 , wherein the first output signal is obtained at a first node between the first resistor and the third resistor, and the second output signal is obtained at a second node between the second resistor and the fourth resistor. 
     
     
       17. The circuitry of  claim 14 , wherein a resistance of the first resistor, the second resistor, the third resistor, and the fourth resistor is about 10 to 100 Ohms. 
     
     
       18. A method, comprising:
 receiving, by a first digital-to-analog converter (DAC), a first digital signal and converting the first digital signal into a first signal; 
 receiving, by a second DAC, a second digital signal and converting the second digital signal into a second signal; 
 receiving, by a signal correlated unit, the first signal from the first DAC and the second signal from the second DAC, wherein the first signal is independent from the second signal; 
 generating, by the signal correlated unit, a third signal and a fourth signal in response to the first signal and the second signal, wherein the third signal and the fourth signal are formed by partial of the first signal and the second signal; 
 transmitting, by the signal correlated unit, the third signal and the fourth signal to a comparator, 
 wherein the third signal and the fourth signal is correlated with each other; 
 generating, by the comparator, a fifth signal in response to the third signal and the fourth signal; 
 generating, by a receiver unit, a feedback signal in response to the fifth signal; and 
 adjusting the first digital signal and the second digital signal based on the feedback signal. 
 
     
     
       19. The method of  claim 18 , wherein the signal correlated circuit includes a first resistor, a second resistor, a third resistor, and a fourth resistor, wherein the first resistor and the second resistor are configured to receive the first input signal, and the third resistor and the fourth resistor are configured to receive the second input signal, and wherein the first resistor is connected between the second resistor and the third resistor, and the fourth resistor is connected between the second resistor and the third resistor. 
     
     
       20. The method of  claim 19 , wherein a resistance of the first resistor is identical to the fourth resistor thereof, and a resistance of the second resistor is identical to the third resistor thereof.